J Jake New member Oct 3, 2011 #1 The resistance of a packing material to a sharp object penetrating it is a force proportional to the fourth power of the penetration depth x; that is, F = kx^4. Calculate the work done to force a sharp object a distance d into the material.
The resistance of a packing material to a sharp object penetrating it is a force proportional to the fourth power of the penetration depth x; that is, F = kx^4. Calculate the work done to force a sharp object a distance d into the material.
